Effect of different treatments of copper surface on its total hemispherical absorptivity bellow 77 K

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• 作者：V. Musilova ; T. Kralik ; P. Hanzelka ; A. Srnka
• 关键词：Metals (A) ; Structural materials (A) ; Heat transfer (C) ; Radiant properties (C) ; Cryostats (F)
• 刊名：Cryogenics
• 出版年：2007
• 出版时间：April 2007
• 年：2007
• 卷：47
• 期：4
• 页码：257-261
• 全文大小：172 K

文摘

Total hemispherical absorptivity of copper surfaces treated with standard industrial methods was measured in dependence on the temperature of thermal radiation, varying from 25 K to 300 K. The sample temperature was typically from 5 K to 40 K and did not exceed 70 K. Usability of chemical and mechanical Cu surface finishing as well as Cu plating with Ni and Au for cryogenic design is discussed. As an example of practical application of our results, the cryogenic design of a LN₂ trap is presented.